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3x > 9
x > 3
b) 3(x - 7) > 7
3x - 21 > 7
3x > 28
x > 28/3
c) 3x + 9 = 18
3x = 9
x = 3
d) 3(8 - 6x) < 8(2x - 10)
24 - 18x < 16x - 80
104 < 34x
x > 104/34